FPGA VAX update, now DIY TTL computers

[woodelf]

Chuck Guzis wrote:

>Consider the very old Packard Bell PB250--22 bit words, fewer than 400
>transistors and 2500 diodes, 63 instructions.  Power consumption about 40
>watts, exclusive of I/O:
>
>The trick, of course, is to use bit-serial methods.  It seems to me that
>one could greatly simplify construction of a homebrew machine that way.
>We're not doing this for speed, right?
>
>  
>
Not really that much,  it is registers that hog all the logic gates.
I guess you would save only about 1/3 of  your logic gates.

>Cheers,
>Chuck
>  
>
I got playing around with 74xx logic and the best I can do for my CPU design
is  about 36 chips for a two bit slice.  Now who sells 3-input NAND's 
and Gated
J/K  F/F's  cheap like they did  in the 70's?  And lots and lots of 14 
pin Sockets!